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The Goodman 20197308 is a genuine OEM air-proving pressure switch for the GMH950453BXAE gas furnace. Set to actuate at -0.10 in. water column and wired normally open (NO), it confirms the inducer draft is pulling correctly before the control board allows ignition — a core safety interlock that prevents firing without proper venting.
Set point accuracy is everything with a pressure switch. The OEM Goodman 20197308 is factory-calibrated to -.10" W.C. for the GMH950453BXAE, so it proves draft reliably without nuisance lockouts. Generic switches with an approximate set point are a common source of intermittent ignition failures. OEM is strongly recommended.
About 15 minutes. Cut power, note and transfer the two spade terminals, remove the mounting screws, and reconnect the hose to the correct port. Confirm the switch closes on a heat call after install.